Finding the Fourth Proportional to 1,550.55, 2,139.94 and 887.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.55 : 2,139.94 = 887.50 : x
2. Step 2: Convert to fraction form
   1,550.55/2,139.94 = 887.50/x
3. Step 3: Cross multiply
   1,550.55x = 2,139.94 × 887.50
4. Step 4: Simplify right side
   1,550.55x = 1,899,196.75
5. Step 5: Solve for x
   x = 1,899,196.75/1,550.55
6. Step 6: Final answer
   x = 1,224.85